Tatsumi Hōjō, a 17-year-old dreamcatcher from the esteemed Hōjō clan, must delve into the dreams of others and even partake in them. Tasked with this fate-bound duty, a dreamcatcher is always accompanied by a dreamwatcher, known as a yumemori, who safeguards them from eternal slumber. After Tatsumi's parents, the previous dreamcatcher and yumemori, perish in the line of duty, Tatsumi inherits their roles. Wrestling with the dangers lurking within dreams, Tatsumi finds support from Kyosuke Kaga, a 28-year-old novelist and dreamseer. Together, they embark on a journey in Tokyo to unlock Tatsumi's extraordinary powers and learn to command them. Despite the Hōjō clan's cautionary tales about yumemori, Tatsumi and Kyosuke's bond deepens, blurring the lines between duty and personal connection.